Refrigerating apparatus



July 1, 1930. J. G. KING El AL REFRIGERATING APPARATUS Filed July 21. 1926 III III [III I fla k/ b 45 4 a a may 4 Patented '1, .v

UNITED i STATES PATENT. FFIB (1. KING- m o'rro 1:. summarizes, or Damon, orno, .ASSIGNOBS, BY m LSSIGNICEIITS, .l'O rn'remamn CORPORATION, A. GOBPOBATIOK OF DELAWARE V. The invention relates refrigerating systems, and particularly to refrigeris to insure the safety of refrigerating sys- -'an evaporator or coolingunit 20 provided ating' systems having relatively high and low pressure portions.

One of the objects of the presentinvention terns b proyiding for the escape of refrigerant ronrthehigh-pressure portion to the low-pressure portion, in case of excessive pressure in the high-pressure portion, while providing for the operation of the system to procure refrigerationafter the excessive pressure has been relieved and thereafter give warning that the system has operated abnormally.

Another object of the present invention is to provide an excessive pressure safety valve which, after once functio to relieve excessive pressure, will permit a restricted amount of fluid to escape.

A. still further object is to provide a'safety valve which is reliable and which can be manufactured at a' relatively low. cost. v

Further objects and advantages of, the

present invention will be apparent from the following description,.reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings:

- Fig. 1 is a diagrammatic view of one form of the improved refrigerating system;

Fig. 2 is a longitudinal cross-sectional view of the improved valve used in the system' Fig. 3 is a fragmentary sectional view of a needle of the valve; I f

Fig. 4 is a 'plan'view of the needle looking from the bottom;

Fig. 5 is a fragmentary sectional view of the valve showing the position thereof when excessive pressureas present within the sys- Fig. 6 is a plan view of. a punctured disc of the'val've.

Referring to the drawings, there is shown with an outlet conduit 21 and an'inlet conduit 22. Refrigerant is withdrawn from 'the Application filed m 21, 1926. Serial m.- 12a,s92.

compressor 23. The compressed refrigerant denser 24 through a pipe 25. The condensed refrigerant passes from the condenser 24 to the evaporator ,20 through the pipe, 22.

The compressor 23 is driven by a motor 27 and is controlled by'"a switch 28 having an expansible chamber 29 which is con nected with the pipe 21 by pipe 30 and is,

'water coil 33 which is utilized for cooling the refrigerant received by the tank 32. The condenser 24 which is located onthe relatiyely high-pressure side of the refrigerating system, is connected by a by-pass to the low-pressure side of the refrigerating system. This by-pass includes a conduit 34 .is delivered from the compressor 23 to a conand an excessive, highressure, relief valve 35, which valve contro s the flow of refrig erant from the high-pressure sid to the love pressure side. The flow ofwater thro h the coil 33 can be controlled in any we 1- known' manner, as, for example, by a valve 33 which is responsive to the pressure within said tank.

with a nipple 38 by which it is secured with.

a coupling 39. Coupling 39- includes a member 40 having anipple 41 which is'connected with the condenser tank 32 and is provided with a shoulder 42. Coupling 39 also includes a nut 44 adapted to screw-threaded] I a shoulder 45 which is arranged to engage" receive the nipple 38, and is provided wit the shoulder 42 of member 40. Adisc 46 rests upon thejend of the member 40 and is clamped between said member and the end of nipple'38.

Body 36 is provided with a chamber 48 in which is located a sleeve 49 having a flange 50 which rests upon the disc 46. A pin 51 is located within the sleeve 49 and terminates directly above the disc 46. Pin 51 is carried by a member 52 having a flange 53. A spring 54 is interposed between the fiange 53 and flange 50 and normally tends to ma ntain the sleeve in engagement with the disc 46. A passage 55 in nipple 36 is connected with the chamber \48 through a slot formed within the upper portion of flange 53. A passage 58 extends through member 40 and is indirect alignment with the needle 51.

The disc 46 is constructed of puncturable or fracturable material, such as solder, German silver, or the like. When excessive pressure is present within the high-pressure side of the refrigerating system, such pressure acting upon the bottom of the disc 46 will force the sameupwardly by movin sleeve 49 upwardly against the tension 0 a spring 54. Since the pin 51 is stationary, the upwardly-moving disc 46 will engage same and will be punctured thereby, as shown in Fig. 5. Thus the excessive pressure will be relieved, since the pressure from the highpressure side will pass the puncture within the disc and enter chamber 48, whence it passes to the low-pressure side through passages 56 and 55, and conduit 34.

The bottom portion of pin 51 is inclined, as at 60, and is concaved at a greater angle, as shown at 61, so as to provide a substantially V-shaped cutting surface. Therefore, when the disc 46 is punctured, the puncture is inthe'shape of a V, as shown in Fig. 6.

When the pressure within the high-pressure side recedes, spring 54 will force the sleeve, and likewise the disc 46, downwardly while the normal pressure within the high-pressure side will maintain the V-shaped puncture substantially in alignment with the remaining portion of the disc. Therefore, when the pressure within the high-pressure side recedes, the puncture is substantially closed, but will permit a restricted amount of fluid to escape therethrough. The restriction 18 such as to limit the fiowfrom the high-pressure side to the low-pressure'side to such a degree that the compressor will still withdraw suflicient refrigerant from the evaporator 20 that refrigeration will take place within said evaporator. However, the flow through the puncture will permit enough refrigerant to pass therethrough so that the compressor will operate continuously or substantially continuously.

enhanced and which also gives warning, af-

functioned properly; while, at the same time,.

refrigeration continues after the temporary abnormal condition has subsided. If the refrigerating system temporarily doesnot function normally, due to, for example, temporary clogging of the water-cooling coil, or a temporary non-performance of a control valve for said 'coil, an excessive pressure will be created and the valve 35 will function. lVhen the abnormal condition ha corrected itself to such a degree that the ressure in the system is substantially norm 1, refrigeration will continue. However, t ere may be a condition which should be c rrected, for example, the repairing of the water coilor readjustment of the control valve thereof. Therefore, although refrigeration still continues, the compressor will operate substantially continuously, thus giving a readilynoticeable warning that the system has at one time not functioned properly and that corrections should be made.

While the form of embodime of the invention as herein disclosed, co stitutes a preferred form, it is to be unde stood that other forms might be adopted, all coming within the scope of the claims which follow.

\Vhat is claimed is as follows:

1. A refrigerating system having a relatively high-pressure side and a'relatively low-pressure side including a cooling unit, a compressor for circulating a refrigerating medium, and conduits connecting said compressor and unit; of a by-pass between said high and low sides; and meansfor opening said b'y-pass to relieve excessive pressure in the high side, said means being constructed and arranged to close partially after the excessive hi h pressure is relieved to provide for the ow of a restricted quantity of medium through said by-pass.

2. A refrigerating system having a relatively high-pressure side and a relatively low-pressure side including a cooling unit, a compressor for circulating a refrigerating medium, and conduits connecting said compressor and unit; of a by-pass between said high and low sides; and a valve in said bypass having a fracturable element adapted to be fractured'due to excessive pressure on said high side and adapted to be closed partially by the pressure in said system after the excessive pressure is relieved to provide for the flow of a restricted quantity of medium through said by-pass.

3. A refrigerating system having a relatively high-pressure side and a relatively low-pressure side including a cooling unit, a compressor for circulating a refrigerating I medium, and conduits connecting said com- Thus, a refrigerating system has been pro vided in which the safeness thereof has been pressor andunit; of a by-pass between said high and low sides; and'a valve in said bypass-having a disc adapted to be punctured due to excessive pressure on said high side and adapted to be closed partially by the pressure in said system after the excessive pressure is relieved to provide for the flow of a restricted quantity of medium through said by-pass.

4. A pressure relief valve comprising a valve body, a fracturable disc member, a pin member adapted to fracture said disc, the cutting surface of said pin member being concaved and disposed at an oblique angle with respect to said disc, one of said members being responsive to pressure within said body and movable with respect to the other.

5. A pressure relief valve comprising a casing having an inlet and an outlet, a flexible diaphragm, a spring coil pressing said diaphragm, and a diaphragm puncturing device within said coil.

6. A pressure relief valve comprising a valve body, a puncturable member, a movable sleeve member bearing against said puncturable member and a stationary member located within said sleeve member adapted to puncture said puncturable member.

7. A pressure relief valve comprising a yalve body, a puncturable member, a movable sleeve member bearing against said puncturable member, a flange on said sleeve, a spring bearing against said flange and maintaining said sleeve in Contact with said puncturable'member and a stationary member located within said sleeve member and adapted to puncture said puncturable member.

signatures.

JESSE G. KING. OTTO M. SUMMERS.

In testimony whereof we hereto aifi x our I 

